Cheap flights to Canada

I was wondering if there was a website or a place where I can get a cheap flight to Ottawa from San Fracisco area. Hoping if there was something like canadian affiars or something of that sort. I am not very picky about my dates during the summer but in the fall season, then i need to go during winter break. if anyone can help me that would be great!

well on ebay they sell like coupons that would seem to make the flight much cheaper (if i fly on the right days and stuff) but i was wondering if there is a cheaper way or if it is legitiment. x_x here is one thing they sell

Well, which place to turn to depends on you (whether you're a student, etc.) and your flight details. I posted all the relevant websites I know. Aside from what other people have posted, you can check out: